My dad actually created a (failed) startup in the early '00s that modeled immigration law in Prolog, enabling the creation of legally accurate forms and resolvi

My dad actually created a (failed) startup in the early '00s that modeled immigration law in Prolog, enabling the creation of legally accurate forms and resolving complex legal queries. It was a good idea, it just failed due to infighting and mismanagement. are there popular languages for implementing these types of DSLs?